Improvement in adjustable sewing-machine chairs



UNTED STATES PATENT rrrcn.

FRANKLIN GHICHES'IER, OF MILWAUKEE, WISCONSIN.

IMPROVEMENT IN ADJUSTABLE SEWING-MACHINE CHAIRS.

Specification forming part of Letters Patent, No. 138,073, dated April 22, 1873; application filed February 15, 1873.

To all whom it may concern:

Be it known that I, FRANKLIN GHIcHEs'rER, of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a new and useful Improvement in Adjustable Sewing- Machine Chair, of which the following is a specification Figure 1 is a side view of my improved chair.

. Fig. 2 is a rear view of the same. Figs. 3 and 4 are detail views of the hinge and spring for connecting the parts ot' the back .to each other.

Similarletters of reference indicate corresponding parts.

My invention has for its object to furnish an improved chair for the use of sewing-machine operators, which shall be so constructed that it may be readily adjusted as the convenience of the operator may require, and the back of which will automatically adjust itself to the back of the operator. A

The invention consists in the combination of the adjustable latches, the side plates, and the coiled springs with the armed cross-bar and chair-seat; in the combination of the socket, the pivot, and the coiled spring with the parts of the chair-back; and in the combination of the coiled springs, thepivoted bars, and the latches with the side plates, the chairseat, and the pivoted chair-arms, as hereinafter fully described.

A represents the pedestal, in which is secured a nut for the screw B, the upper end of which is secured to the center of the cross-bar C. The ends of the cross-bar C have downwardly-projecting arms formed upon them, to the lower ends of which are attached pivots or bolts D. To the outer ends of thepivots or bolts D are pivoted the lower ends of the rear arms of the platesE, which plates are attached to the side edges of the chair-seat F. The upper middle part of the rear arms ot' the plates E is cut away so that its lower edge may be about upon a level with the top of the crossbar G, and insa-id edge are formed notches to receive the latch G. The latch G extends along the top of the cross-bar C, and its inner end is pivoted to lugs formed upon the top of said cross-bar C, the said pivot passing through a short slot in the said latch, so that the latch may be drawn out to enter the notches of the plate E, and pushed in to release said plate.

The latch G is kept from lateral movement by guide-lugs attached 'to the ends of the upper side of the cross-bar C, and is locked in either position by a projection or tooth formed upon the upper side of the said cross-bar C, and which enters notches in the under side of the said latch Gr. H are springs which are coiled around the inner parts of the pivots or bolts D, and one end of which is secured to the arms of the cross-bar C. The other ends of the springs H project upward and forward, and are connected with the lower side of the forward part of the chair-seat F, as shown in Fig. l. By this construction the chair-seat is held securely in place when adjusted by the latches G, the springs H simply making the adjustment more easy. By making the springs H sufficiently strong, and adjusting the latches,

Gr out ot' gear with the plates E, the chair may be used as a rocking or oscillating chair. To the lower ends of the forward arms of the plates E are rigidly attached the bolts or pins I, around which are coiled the springs J, one end of which is attached to the said pins or bolts. The other end of the springs J are attached to the levers or connecting-bars K, the

of the chair-back N O. The lower edge of the lower part N of the chair-back is hinged to the rear edge of the chair-seat F, so that it may be adjusted in any desired position by adjust ing the arms L by means of the bars K and latches M, the springs J making the adjustmeut more easy. The lower part N ofthe back consists of a cross-bar and two side bars. To the upper ends ot' the side-bars ot' the lower part N are attached sockets P to receive the pivots Q attached to the middle parts of the side edges of the upper part 0 of the back. The socket l? is chambered out, and in the space thus formed is placed a coiled spring, R,

ESSADW one end of which is connected with the socket P, and its other end is connected with the pivot Q. The coiled spring R is so formed as to tend to throw the lower end of the said part O forward against the back of the person sittin g in the chair. The adjacent edges of the parts of the hinge P Q are notched to each other to serve as stops to limit the movement of the back O. The upper parts of the side edges of the part O project so as to be inline with the side edges of the lower part N, as shown in Fig. 2. The two parts N O of the back may be rigidly connected with each other when desired by a button, S, pivoted to the lower edge of the part' O, and which rests against the cross-bar of the part N.

Having thus described myinvention, I claim as new and desire to secure by Letters Patentl. The combination ofthe adjustable latches Gr, side plates E, and coiled springs H with the armed cross-bar C and the chairseat F, substantially as herein shown and described.

2. The combination of the socket P, pivot Q, and coiled spring l with the parts N O of the chair-back, substantially as herein shown and described.

3. The combination of the coiled springs J, pivoted bars K, and latches M with the plates E, chair-seat F, and pivoted chair-arms L, substantially as herein shown and described.y

FRANKLIN CHIGHES'IER.

Witnesses:

C. P. FOOTE, S. J HOOKER. 

